Engine Performance Flashcards
How do you calculate torque?
Force x Distance
What is the definition of Brake Horsepower (BHP) in regards to an aircraft engine?
The actual amount of power delivered to the propeller shaft
What is the formula for calculating BHP?
(check answer with pg 57 of PDF)
Define Brake Mean Effective Pressure (BMEP).
It is the average pressure to produce BHP
What is the pressure generated in the cylinder called?
Friction Mean Effective Pressure
What is the horsepower constant?
33,000
Finish the sentence: One horsepower is the amount of work required to do…
33,000 foot-pounds of work in one minute
What is the formula used to calculate horsepower?
(check answer with pg 59 of the PDF)
Indicated Horsepower (IHP) is?
The total power actually developed in an engine’s cylinder without reference to friction loss
What is the formula for IHP?
(check answer with pg 59 of the (PDF)
What is Friction Horsepower (FHP)?
The amount of power required to overcome friction within the engine
What is Specific Fuel Consumption (SFC) important for?
It is important for comparing efficiencies of engines
Which is more commonly used for calculating SFC? Brake or indicated?
Brake Specific Fuel Consumption
Generally speaking, what is the ‘useful’ range of AFR mixtures for a standard piston engine?
Between 9:1 and 16:1
What is considered to be the best rich mixture?
12:1
